package com.freight.common.wlhyupload.util;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SM4Utils {

    public String secretKey = "";
    private String iv = "";
    public boolean hexString = false;

    public SM4Utils(String secretKey, boolean hexString)
    {
        this.secretKey = secretKey;
        this.hexString = hexString;
    }
    public SM4Utils(String secretKey)
    {
        this.secretKey = secretKey;
        this.hexString = false;
    }
    public SM4Utils()
    {
    }
//      
//    public byte encryptData_ECB1(byte[] inputStream){
//        try   
//        {  
//            SM4_Context ctx = new SM4_Context();  
//            ctx.isPadding = true;  
//            ctx.mode = SM4.SM4_ENCRYPT;  
//              
//            byte[] keyBytes;  
//            if (hexString)  
//            {  
//                keyBytes = Util.hexStringToBytes(secretKey);  
//            }  
//            else  
//            {  
//                keyBytes = secretKey.getBytes();  
//            }  
//              
//            SM4 sm4 = new SM4();  
//            sm4.sm4_setkey_enc(ctx, keyBytes);   
//            String cipherText = new BASE64Encoder().encode(inputStream);  
//            if (cipherText != null && cipherText.trim().length() > 0)  
//            {  
//                Pattern p = Pattern.compile("\\s*|\t|\r|\n");  
//                Matcher m = p.matcher(cipherText);  
//                cipherText = m.replaceAll("");  
//            }  
//            return cipherText;  
//        }   
//        catch (Exception e)   
//        {  
//            e.printStackTrace();  
//            return (Byte) null;  
//        }  
//    }

    public String encryptData_ECB(String plainText)
    {
        try
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            if (hexString)
            {
                keyBytes = Util.hexStringToBytes(secretKey);
            }
            else
            {
                keyBytes = secretKey.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0)
            {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_ECB(String cipherText)
    {
        try
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            if (hexString)
            {
                keyBytes = Util.hexStringToBytes(secretKey);
            }
            else
            {
                keyBytes = secretKey.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public String encryptData_CBC(String plainText)
    {
        try
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString)
            {
                keyBytes = Util.hexStringToBytes(secretKey);
                ivBytes = Util.hexStringToBytes(iv);
            }
            else
            {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0)
            {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_CBC(String cipherText)
    {
        try
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString)
            {
                keyBytes = Util.hexStringToBytes(secretKey);
                ivBytes = Util.hexStringToBytes(iv);
            }
            else
            {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) throws IOException
    {
        String plainText = "ererfeiisgod";
        SM4Utils sm4 = new SM4Utils("JeF8U9wHFOMfs2Y8");
        System.out.println("ECB模式加密");
        String cipherText = sm4.encryptData_ECB(plainText);
        System.out.println("密文: " + cipherText);
        System.out.println("");

        plainText = sm4.decryptData_ECB(cipherText);
        System.out.println("明文: " + plainText);
        System.out.println("");

//        System.out.println("CBC模式加密");
//        sm4.iv = "UISwD9fW6cFh9SNS";
//        cipherText = sm4.encryptData_CBC(plainText);
//        System.out.println("密文: " + cipherText);
//        System.out.println("");
//
//        plainText = sm4.decryptData_CBC(cipherText);
//        System.out.println("明文: " + plainText);
//
//        System.out.println("CBC模式解密");
//        System.out.println("密文：4esGgDn/snKraRDe6uM0jQ==");
//        String cipherText2 = "4esGgDn/snKraRDe6uM0jQ==";
//        plainText = sm4.decryptData_CBC(cipherText2);
//        System.out.println("明文: " + plainText);
    }
}